不同排布下球壳结构群体风致干扰效应风洞试验研究  

Wind tunnel test study on wind-induced interference effect of spherical shell structures in different arrangements

作　　者：王鉴可 郑延丰[1] 罗尧治[1] WANG Jian-ke;ZHENG Yan-feng;LUO Yao-zhi(Space Structures Research Center,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江大学空间结构研究中心,浙江杭州310058

出　　处：《空间结构》2022年第1期3-12,共10页Spatial Structures

基　　金：十三五重点研发计划(2017YFC0806100)。

摘　　要：风荷载是影响各类大跨屋盖设计的重要因素,而由群体产生的干扰效应又常常使风场更加复杂,使结构在风荷载作用下表现出不同于单体的响应.本文通过风洞试验技术,分别考虑球壳群在一字形、品字形、四边形三种典型排布方式、三种不同间距(R/3、R/2、R)以及不同风向角下的群体干扰效应.通过数值统计等方法,对不同影响因素进行分析和对比;使用竖向整体升力系数(C_(F))和局部干扰因子(IF)等指标,对不同群体类型的干扰效应进行评估.研究表明:球壳群在风荷载作用下的表面风压分布特性随风向角及排布形式的变化会产生较大差异;球壳在群体干扰影响下,竖向整体风荷载最高可能会有约40%的放大;总体而言,在抵抗风致静力荷载中,团簇型排布比直线型排布具有更大的优势;球壳群体对于风向角的变化更加敏感,而对于相隔间距变化的敏感性较低.Wind load is an important factor affecting the design of various types of long-span structural roofs,and the interference effect induced by domes often makes the wind field more complex and causes the structure to behave differently from the single dome under wind loads.In this paper,wind tunnel test technology is used to consider the interference effect of the spherical shell group in three typical arrangements(line type,regular triangle type and regular quadrilateral type),three different spacings(R/3,R/2,R),and various wind directions.Numerical statistics is used to analyze and compare different influencing factors.Indicators such as the overall lift force coefficient(C_(F))and local interference factor(IF)are used to evaluate the interference effects of different arrangement types of groups.The research demonstrates the following conclusions.1)The wind pressure distribution characteristics on the surface of spherical shell group under wind load vary greatly with the change of wind direction angle and arrangement.2)Under the influence of group interference effect,the maximum vertical wind load of spherical shell may be amplified by about 40%.3)In general,the cluster-type arrangement has greater advantages than the line-type arrangement in the resistance to wind-induced static loads.4)Spherical shells are more sensitive to variation in wind direction angle,but less sensitive to variation in spacing.

关 键 词：大跨度屋盖 球壳 群体效应 风致干扰 风洞试验 

分 类 号：TU393.3[建筑科学—结构工程] TU312.1